Maxim Integrated Secure Microcontroller - Manual (Page 43)

Secure Microcontroller User’s Guide
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*A 4kB increment (not 2kB) takes place between PA3–0 values 1110b and 1111b.
MCON.3 RA32/8
Range Address Set the maximum usable address on the bytewide bus.
RA32/8 = 0 sets range address = 1FFFH (8kB)
RA32/8 = 1 sets range address = 7FFFH (32kB)
Set to 1 during a no-V
LI
reset and when the security lock bit is cleared by hardware
or the bootstrap loader. Remains unchanged on all other types of resets.
MCON.2
ECE2
Enable Chip Enable 2 Used to enable or disable the
CE2 signal for the bytewide bus data memory. When
ECE2 = 0, all MOVX instructions activate the
CE1 signal. When ECE2 = 1, all
MOVX instructions activate the
CE2 signal. This bit should always be cleared to 0
in the DS5000, DS5000-32, DS2250-8, and DS2250-32 versions.
MCON.1 PAA
Partition Address Access Used to protect the programming of the partition address select bits. PA3–0 cannot
be written when PAA = 0. PAA can be written only via the timed-access register.
MCON.0
SL
Security Lock Indicates that the security lock is set when SL = 1. Can only be modified by the
lock and unlock commands of the bootstrap loader. This bit cannot be modified by
the application software or by the bootstrap loader write command.